Decodder presentation by ibrar
- 1. NAME IBRAR KHAN SUBJECT DLD 2 nd SEMESTER MCS TEACHER ISRAR AHMAD
- 2. WHAT IS ENCODER? DECODER? MULTIPLEXER?
- 3. DECODER A decoder is a combinational circuit that converts binary information form n put lines to a maximum of 2n outlines The three input variable may represent a binary number and the output will represent the eight digits in the octal number system . Input n=output 2N
- 4. D 0=x`y`z` D 1=x`y`z D 2=x`y z` D 3=x`y z D 4=x y` z` D 7=x y z D 6=x y z` D 5=x y` z z y D 0 x inverter x y z xyz 1 1 1 1 AND 3-to-8 line decoder circuit
- 5. The three input x y z are decoded into eight output. Each output representing one of the minterms. Of the 3 input variables. Truth table 3 to 8 line decoder x y z D0 D1 D2 D3 D4 D5 D6 D7 outputs inputs 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 1 0 0 0 1
- 6. Encoder An Encoder is a digital function that produce a reverse operation from that of a Decoder. An encoder 2n input line and n output line. Example when we enter a word or hexadecimal number in the keyboard ,behind the keyboard a circuit works which convert the word or hexadecimal to binary.
- 7. D 0 D 1 D 2 D 3 D 4 D 5 D 6 D 7 X=D4+D5+D6+D7 y=D2+D3+D6+D7 z=D1+D3+D5+D7 Octal to binary encoder x y z x+y+z o o o 0 1 0 0 1 OR
- 8. Truth table of octal to binary encoder input output D0 D1 D2 D3 D4 D5 D6 D7 X Y Z 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1
- 9. Multiplexers Multiplexing mean transmitting a large number of information unite over a smaller number of channel or lines. A digital multiplexer is a combinational circuit that selects binary information from one of many inpt line and directed it to a single output .
- 10. S1 S0 y 0 0 0 1 0 1 1 i0 i1 i2 i3 S1 s0 i0 i3 i2 i1 y A 4 to 1 line multiplexer x y x y 0 0 0 0 1 0 0 0 1 1 1 AND
- 11. THE END